Developers from California plan to bring new life to the Jefferson Arms building on N. Tucker.

They will turn one part of the building into a Marriott Hotel, and the other part into apartments. There will also be a banquet room and more than 18,000-square-feet of commercial space.

Wednesday, the developers of the project, Alterra International, opened Jefferson Arms' doors for a tour of the hotel which has been vacant for more than a decade.

While some areas look a little rough, the developers knew they wanted it at first sight.

"We actually fell in love with this one. It's not a good idea as a developer to fall in love, but we did because it's absolutely beautiful," said Mike Sarimsakcs, president of Alterra International. "The outside is just gorgeous."

PHOTOS: Inside the abandoned Jefferson Arms hotel.

After removing asbestos, and tearing out all the old plumbing and wiring, they will renovate the building from top to bottom.

The developers work on projects like this in major cities across the country and said they were attracted to St. Louis because of the area's strong economy and thriving startup community.